On the title screen, press A, B, L, and R all at the same time.

Hold A + B on the gameover screen, then press start.

Pause then hold L+R and press select.

On the title screen, press A, B, L, and R all at the same time.

In certain levels, the screen moves forward and pushes you along. If you get a certain number of coins within these said levels, you unlock a secret white mushroom house holding a powerful item. Below are the levels and the number of coins needed in each level.

White mushroom house: Level 1-4:
Collect 44 coins within the level

White mushroom house: Level 2-2:
Collect 30 coins within the level

White mushroom house: Level 3-8:
Collect 41 coins within the level

White mushroom house: Level 4-2:
Collect 22 coins within the level

White mushroom house: Level 5-5:
Collect 28 coins within the level

White mushroom house: Level 6-7:
Collect 78 coins within the level

White mushroom house: Level 7-2:
Collect 41 coins within the level

Complete the first 8 worlds without warping.

To get an Extra Life, make sure that when you touch the flagpole, the last digit of the timer is a multiple of the number of coins you have (Example: TIMER 231/COINS = 11). This also works with 0. Do this correctly and instead of getting a point bonus, you will get a 1-UP.

In World B-4, go to the very last pipe in the level (it's next to a lava pit). Jump in the pipe and you will be taken to a Warp Zone area that will lead to World D.

To ''hide'' behind scenery, simply hold down for a couple seconds while standing on a white block. Then your player can ''hide'' behind scenery for about thirty seconds.

To get an Extra Life, make sure that when you touch the flagpole, the last digit of the timer is a multiple of the number of coins you have (Example: TIMER = 231/COINS = 11). This also works with 0. Do this correctly and instead of getting a point bonus, you will get a 1-UP.

If you finish a level (touch the flagpole) when the ones digit of the time is 1, 3, or 6, there will be that many fireworks and each one is worth 500 points.

Get on top of the ceiling in world 4-2 and run past the end pipe that leads to the flagpole. You will find a lone pipe that warps you to world 5

To find a Warp Zone that can take you Level 2, 3, or 4 go to the part of world 1-2 then get to the part of the world at the end where all the platforms are moving up. Jump on one, then leap on top of the ceiling from there. Keep going until you reach five pipes. It'll say ''Welcome to Warp Zone!'' with a number above each pipe. The 2 takes you to level 2, the three to level 3, and the four to level four.

Go to World 3-1 and enter the door to the waterfall and clouds. Drop down the waterfall to a door way down below. Find the potion in the huge patch of vegetables and take it to the vase next to the door. Enter Sub Space and stand on top of the vase and press down on the d-pad to enter the vase. You will be taken to 5-1

Go to World 4-2 and proceed to the whales. Find a potion and get to the island with the vase. Place the potion down and enter the door that appears to go into Sub Space. Warp down the vase to World 6-1

Go to World 5-3 and find a potion. Proceed all the way back left and use Luigi's squat jump or an enemy to get to the platform with the vase. Drop the potion and enter Sub Space and warp down the vase to World 7-1

At the end of the game, when Bowser uses his jump attack on you, duck if you are big Mario, or stay still if you are small Mario. Bowser will break the bricks, but he won't hurt you. If you are small Mario, you can run right through Bowser and not get hurt.

Complete levels until you get to toads mushroom house, where you get to open a chest for an item. Get the item, save and exit. Now reload the file and the levels you finished will still be completed but toads house will be back so you can get the item again! :D Repeat until you have as many as you need. Also this works for the extra lives slot and the memory card game houses too.

Make sure you're Fire Mario/Luigi when you reach Bowser. Blast him with fireballs, but don't grab the axe just yet. Instead, wait the timer out, but make sure you're next to the axe when there's about 50 seconds left. Now get ready and time your jump on the axe so the Timer reads '000'. Once you reach Toad and the game adds the Timer to your score, you may notice that it changed from '000' to '999'. Thus the game thinks you finished with '1000' on the Timer and times that by 5. Note: this does not work on the Original NES version of the game.

To get the N-Spade card game to appear on the World Map. You must do gain 80,000 points as one player, and successfully beat the stage that you broke the 80,000 points with.